git.ozlabs.org Git - ccan/blob - ccan/io/test/run-10-many.c

   1 #include <ccan/io/io.h>
   2 /* Include the C files directly. */
   3 #include <ccan/io/poll.c>
   4 #include <ccan/io/io.c>
   5 #include <ccan/tap/tap.h>
   6 #include <sys/wait.h>
   7 #include <stdio.h>
   8
   9 #define NUM 100
  10 #define NUM_ITERS 1000
  11
  12 struct buffer {
  13         int iters;
  14         struct io_conn *reader, *writer;
  15         char buf[32];
  16 };
  17
  18 static struct io_plan poke_reader(struct io_conn *conn, struct buffer *buf);
  19
  20 static struct io_plan poke_writer(struct io_conn *conn, struct buffer *buf)
  21 {
  22         assert(conn == buf->reader);
  23
  24         if (buf->iters == NUM_ITERS)
  25                 return io_close();
  26
  27         /* You write. */
  28         io_wake(buf->writer,
  29                 io_write(&buf->buf, sizeof(buf->buf), poke_reader, buf));
  30
  31         /* I'll wait until you wake me. */
  32         return io_idle();
  33 }
  34
  35 static struct io_plan poke_reader(struct io_conn *conn, struct buffer *buf)
  36 {
  37         assert(conn == buf->writer);
  38         /* You read. */
  39         io_wake(buf->reader,
  40                 io_read(&buf->buf, sizeof(buf->buf), poke_writer, buf));
  41
  42         if (++buf->iters == NUM_ITERS)
  43                 return io_close();
  44
  45         /* I'll wait until you tell me to write. */
  46         return io_idle();
  47 }
  48
  49 static struct buffer buf[NUM];
  50
  51 int main(void)
  52 {
  53         unsigned int i;
  54         int fds[2], last_read, last_write;
  55
  56         plan_tests(5 + NUM);
  57
  58         ok1(pipe(fds) == 0);
  59         last_read = fds[0];
  60         last_write = fds[1];
  61
  62         for (i = 1; i < NUM; i++) {
  63                 if (pipe(fds) < 0)
  64                         break;
  65                 memset(buf[i].buf, i, sizeof(buf[i].buf));
  66                 sprintf(buf[i].buf, "%i-%i", i, i);
  67
  68                 /* Wait for writer to tell us to read. */
  69                 buf[i].reader = io_new_conn(last_read, io_idle());
  70                 if (!buf[i].reader)
  71                         break;
  72                 buf[i].writer = io_new_conn(fds[1],
  73                                             io_write(&buf[i].buf,
  74                                                      sizeof(buf[i].buf),
  75                                                      poke_reader, &buf[i]));
  76                 if (!buf[i].writer)
  77                         break;
  78                 last_read = fds[0];
  79         }
  80         if (!ok1(i == NUM))
  81                 exit(exit_status());
  82
  83         /* Last one completes the cirle. */
  84         i = 0;
  85         sprintf(buf[i].buf, "%i-%i", i, i);
  86         buf[i].reader = io_new_conn(last_read, io_idle());
  87         ok1(buf[i].reader);
  88         buf[i].writer = io_new_conn(last_write,
  89                                     io_write(&buf[i].buf, sizeof(buf[i].buf),
  90                                              poke_reader, &buf[i]));
  91         ok1(buf[i].writer);
  92
  93         /* They should eventually exit */
  94         ok1(io_loop() == NULL);
  95
  96         for (i = 0; i < NUM; i++) {
  97                 char b[sizeof(buf[0].buf)];
  98                 memset(b, i, sizeof(b));
  99                 sprintf(b, "%i-%i", i, i);
 100                 ok1(memcmp(b, buf[(i + NUM_ITERS) % NUM].buf, sizeof(b)) == 0);
 101         }
 102
 103         /* This exits depending on whether all tests passed */
 104         return exit_status();
 105 }